Primary Fabrication Processes for Nickel and Iron Aluminides

Conference · Mon Sep 23 00:00:00 EDT 1991 · SAE Technical Paper Series

DOI:https://doi.org/10.4271/912194· OSTI ID:5239335

Weir, Jr., James R. ^[1]; Sikka, Vinod K. ^[1]

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1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Alloys based on the intermetallic compounds Ni₃Al and Fe₃Al have been developed. Intermetallic compounds are characteristically brittle at room temperature, and some are also brittle at elevated temperatures. Nickel-aluminide alloys have been made ductile by alloying with a small amount of boron (200 ppm by weight) and adjusting the aluminum content to 24 at. % or less. Iron-aluminide alloys are ductile when chromium is added (>wt 2%) and the aluminum is adjusted to 28 at. %. These alloys begin ordering upon solidification; therefore, a greater shrinkage must be accommodated during casting. The hot-working temperature “window” for the nickel-aluminide alloy is very narrow; however, the alloy can be cold-worked large amounts. Iron-aluminide alloys have a very broad hot-working temperature range but have limited ductility (<20%) at room temperature. The strength and oxidation resistance of these alloys are such that many potential applications exist. Commercialization is in progress.

• Research Organization: Oak Ridge Y-12 Plant (Y-12), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Buildings and Industry. Industrial Efficiency & Decarbonization Office (IEDO); USDOE Office of Fossil Energy and Carbon Management (FECM)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5239335
• Report Number(s): CONF-9109281--1; ON: DE91018855
• Journal Information: SAE Technical Paper Series, Journal Name: SAE Technical Paper Series Vol. 1; ISSN 0148-7191
• Publisher: SAE International
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals &amp; Alloys-- Preparation &amp; Fabrication
360103 -- Metals &amp; Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
DUCTILITY
FABRICATION
INTERMETALLIC COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
METALLURGY
NICKEL ALLOYS
NICKEL BASE ALLOYS
STRAINS
STRESSES
TENSILE PROPERTIES